Array Join vs String Concat

Question

Which method is faster?

Array Join:

var str_to_split = \"a,b,c,d,e,f,g,h,i,j,k,l,m,n,o,p,q,r,s,t,u,v,w,x,y,z\";
var myarray = str_to         


        

Answer 1

Manual concatenation is faster, for a numeric array of fixed length.

Here's a JSPerf test that tests these two operations:

zxy.join('/')

// versus

zxy[0] + '/' + zxy[1] + '/' + zxy[2]

// given the array

zxy = [1, 2, 3]

// resulting in the string '0/1/2'

Results: Using Chrome 64.0.3282.186, Array.join was 46% slower.